試卷：無年度 - 95年10月TOFEL閱讀(Page23-24)#20916
| 科目：TOEFL(Test of English as a Foreign Language)托福
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試卷名稱：無年度 - 95年10月TOFEL閱讀(Page23-24)#20916
科目：TOEFL(Test of English as a Foreign Language)托福
49. According to the information in the third paragraph, which of the following improvements made it possible to lengthen the tone produced by the piano?
(A) The introduction of pedals
(B) The use of heavy wires
(C) The use of felt-padded hammerheads
(D) The metal frame construction
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